[Risolto] Problem translating some string

Background of the issue:
I am trying to translate some strings on my site link nascosto using WPML. I followed the guide at https://wpml.org/documentation/support/language-configuration-files/how-to-register-page-builder-widgets-for-translation/ to register page builder widgets for translation.

Symptoms:
The array mentioned in the guide doesn't appear in the translation panel.

Questions:
How can I mad it appear to solve the translation problem?